CN109441671A - A kind of low diagnostic system and method that pipeline is desorbed of engine - Google Patents
A kind of low diagnostic system and method that pipeline is desorbed of engine Download PDFInfo
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- CN109441671A CN109441671A CN201811258587.0A CN201811258587A CN109441671A CN 109441671 A CN109441671 A CN 109441671A CN 201811258587 A CN201811258587 A CN 201811258587A CN 109441671 A CN109441671 A CN 109441671A
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- engine
- pipeline
- low
- inlet manifold
- desorbed
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003795 desorption Methods 0.000 claims abstract description 62
- 238000003745 diagnosis Methods 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 11
- 238000002405 diagnostic procedure Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 description 7
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M2025/0845—Electromagnetic valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Examining Or Testing Airtightness (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The present invention provides a kind of engine the low diagnostic system and method that pipeline is desorbed, and canister is connect by low desorption pipeline with the inlet manifold, which includes: diagnosing controller, solenoid valve and pressure sensor；The control terminal of the solenoid valve is connected with the first output end of the diagnosing controller, and the solenoid valve is set to the low desorption pipe road, for controlling being turned on or off for canister and the inlet manifold；The output end of the pressure sensor is connected with the first input end of the diagnosing controller, and the pressure sensor is set on the inlet manifold, for detecting the gas pressure in the inlet manifold；In magnet-valve conducting, if the changing value of the gas pressure is greater than first pressure threshold value, the diagnosing controller determines that the low desorption pipeline is in normal condition, otherwise determines that the low desorption pipeline is in leak condition.The present invention can improve safety and the environmental-protecting performance of automobile.
Description
Technical field
The present invention relates to the diagnostic systems and method of the low desorption pipeline of automobile technical field more particularly to a kind of engine.
Background technique
Low desorption pipe-line system is common system in a kind of naturally aspirated engine, the oil gas that canister absorbs can be mixed
Gas and exhaust gas are closed, inlet manifold is transmitted to, participates in gas in-cylinder combustion again, prevents the dilution harm such as machine oil and lubricating oil leakage hair
It is raw.
But it still is exposed engine lubricating oil leakage there are many automobile on the market, it is this in order to preferably cope with solution
Problem increases the OBD diagnosis to low desorption pipe-line system leakage in six emission regulation of state, and is made that clear stipulaties: when being
When canister, canister control valve and the pipeline of system disconnect or when canister, canister control valve and pipeline leak,
OBD system should monitor that the pipeline system failure is desorbed in low pressure.
Summary of the invention
The present invention provides a kind of engine the low diagnostic system and method that pipeline is desorbed, and solves existing automobile engine and uses
The problem of lacking pipeline leakage and fault diagnosis when low desorption pipeline, easily cause oil leakage phenomenon, can improve automobile safety and
Environmental-protecting performance.
In order to achieve the above object, the present invention the following technical schemes are provided:
A kind of low diagnostic system that pipeline is desorbed of engine, canister are connect by low desorption pipeline with the inlet manifold,
It include: diagnosing controller, solenoid valve and pressure sensor；
The control terminal of the solenoid valve is connected with the first output end of the diagnosing controller, and the solenoid valve is set to institute
Low desorption pipe road is stated, for controlling being turned on or off for canister and the inlet manifold；
The output end of the pressure sensor is connected with the first input end of the diagnosing controller, the pressure sensor
It is set on the inlet manifold, for detecting the gas pressure in the inlet manifold；
It is described to examine if the changing value of the gas pressure is greater than first pressure threshold value in magnet-valve conducting
Disconnected controller determines that the low desorption pipeline is in normal condition, otherwise determines that the low desorption pipeline is in leak condition.
Preferably, further includes: air throttle；
The air throttle is arranged on the inlet manifold, and the air inflow of engine is entered for adjusting extraneous gas；
The control terminal of the air throttle is connected with the second output terminal of the diagnosing controller, is less than in the gas pressure
When second pressure threshold value, the diagnosing controller controls the air inflow that the solar term valve regulation increases engine.
Preferably, further includes: speed probe；
The output end of the speed probe is connected with the second input terminal of the diagnosing controller, the speed probe
For detecting engine speed；
The diagnosing controller adjusts the aperture of the air throttle according to the engine speed, with adjust engine into
Tolerance.
Preferably, the diagnosing controller is also used to for engine to be in start-up course and the corresponding institute of overload process
It states engine speed and is set as non-diagnostic region less than the first rotary speed threshold value and greater than the second rotary speed threshold value, and by the engine
Revolving speed is greater than first rotary speed threshold value and is set as diagnostic region less than the second revolving speed threshold values；
When the engine speed and the gas pressure are in the diagnostic region, the diagnosing controller starts pair
Whether the low desorption pipeline, which is in leak condition, is diagnosed；
When the engine speed and the gas pressure are in the non-diagnostic region, the diagnosing controller is reported
Diagnose Stop message.
Preferably, further includes: engine controller；
The engine controller is connected by CAN bus with the diagnosing controller, is in the low desorption pipeline
When leak condition, the diagnosing controller sends leakage alarm message, the hair to the engine controller by CAN bus
Motivation controller controls engine according to the leakage alarm message and carries out limitation output torque, and lights engine failure lamp.
Preferably, further includes: the combination instrument being connected with CAN bus；
The combination instrument is shown according to the leakage alarm message and/or voice broadcast fault message.
The present invention also provides a kind of diagnostic methods of the low desorption pipeline of engine, comprising:
Solenoid valve is set on low desorption pipe road, to control being turned on or off for canister and inlet manifold；
Pressure sensor is set on inlet manifold, to detect the gas pressure in inlet manifold；
In magnet-valve conducting, if the changing value of the gas pressure is greater than first pressure threshold value, institute is determined
It states low desorption pipeline and is in normal condition, otherwise determine that the low desorption pipeline is in leak condition.
Preferably, further includes:
Air throttle is set on inlet manifold, the air inflow of engine is entered for adjusting extraneous gas；
If the gas pressure is less than second pressure threshold values, increase the air inflow of engine by solar term valve regulation.
Preferably, further includes:
Speed probe is set, adjusts the air throttle for detecting engine speed, and by the engine speed
Aperture, to adjust the air inflow of engine；
Engine is in start-up course and the corresponding engine speed of overload process less than the first revolving speed threshold
Value and be set as non-diagnostic region greater than the second rotary speed threshold value, and by the engine speed be greater than first rotary speed threshold value and
Diagnostic region is set as less than the second revolving speed threshold values；
If the engine speed and the gas pressure are in the diagnostic region, it is to the low desorption pipeline
It is no to be diagnosed in leak condition；
If the engine speed and the gas pressure are in the non-diagnostic region, diagnosis is reported to stop letter
Breath.
Preferably, further includes:
If the low desorption pipeline is in leak condition, by CAN bus to leakage alarm message is sent, so that hair
Motivation carries out limitation output torque, and lights engine failure lamp；
It is shown also according to the leakage alarm message and/or voice broadcast fault message.
The present invention provides a kind of engine the low diagnostic system and method that pipeline is desorbed, and passes through and controls low desorption pipe road
Solenoid valve folding makes gas pressure in inlet manifold generate variation, diagnosing controller gas pressure changing value less than the
Determine that low desorption pipeline is in leak condition when one pressure threshold.Lack when solving existing automobile engine using low desorption pipeline
Pipeline leakage and fault diagnosis, can improve safety and the environmental-protecting performance of automobile at the problem of easily causing oil leakage phenomenon.
Detailed description of the invention
In order to illustrate more clearly of specific embodiments of the present invention, attached drawing needed in the embodiment will be made below
Simply introduce.
Fig. 1: being a kind of diagnostic system structural schematic diagram of the low desorption pipeline of engine provided by the invention；
Fig. 2: being a kind of diagnostic method flow chart of the low desorption pipeline of engine provided by the invention.
Specific embodiment
The scheme of embodiment in order to enable those skilled in the art to better understand the present invention with reference to the accompanying drawing and is implemented
Mode is described in further detail the embodiment of the present invention.
The requirement that reach state six for low desorption pipeline for current automobile avoids making because of the leakage of low desorption pipeline
At oil leakage phenomenon.The present invention provides a kind of engine the low diagnostic system and method that pipeline is desorbed, and passes through and controls low desorption pipeline
On solenoid valve folding, so that gas pressure in inlet manifold is generated variation, diagnosing controller is small in the changing value of gas pressure
Determine that low desorption pipeline is in leak condition when first pressure threshold value.When solving existing automobile engine using low desorption pipeline
The problem of lacking pipeline leakage and fault diagnosis, easily causing oil leakage phenomenon, can improve safety and the environmental-protecting performance of automobile.
As shown in Figure 1, a kind of low diagnostic system that pipeline is desorbed of engine, canister pass through low desorption pipeline and the air inlet
Menifold connection, comprising: diagnosing controller, solenoid valve and pressure sensor.The control terminal of the solenoid valve and the diagnosis control
First output end of device is connected, and the solenoid valve is set to the low desorption pipe road, for controlling canister and the air inlet qi
Pipe is turned on or off.The output end of the pressure sensor is connected with the first input end of the diagnosing controller, the pressure
Force snesor is set on the inlet manifold, for detecting the gas pressure in the inlet manifold.It is led in the magnet-valve
When logical, if the changing value of the gas pressure is greater than first pressure threshold value, the diagnosing controller determines the low desorption
Pipeline is in normal condition, otherwise determines that the low desorption pipeline is in leak condition.
Specifically, the changing value that the gas pressure value in inlet manifold is detected by pressure sensor, can determine pipeline
Whether disconnection or leakage are had.If pipeline is without disconnecting or leaking, when the moment that solenoid valve is opened, inlet manifold can enter largely from low
The gas that pipeline is sent out is desorbed, the pressure value of pressure sensor acquisition can be improved instantaneously.It is set when the changing value of gas pressure is greater than
When level pressure force threshold, then entire pipeline No leakage is assert.If pipeline it is already off or leakage, solenoid valve open it is instantaneous, into
Atmospheric pressure is not have fluctuation, then may determine that pipeline is already off or leaks.The system passes through to gas in inlet manifold
The changing value of pressure judge the leakage situation of low desorption pipeline, can improve safety and the environmental-protecting performance of automobile.
The system further include: air throttle.The air throttle is arranged on the inlet manifold, for adjust extraneous gas into
Enter the air inflow of engine.The control terminal of the air throttle is connected with the second output terminal of the diagnosing controller, in the gas
When body pressure is less than second pressure threshold value, the diagnosing controller controls the air inflow that the solar term valve regulation increases engine.
In practical applications, in the case where normal working of engine, admission pressure also has micro fluctuation, but with solar term
The regulation of door, and the state before fluctuation can be returned to.It should be noted that extraneous gas needs before entering engine by air filter
Clear device is filtered.
The system further include: speed probe.The second of the output end of the speed probe and the diagnosing controller
Input terminal is connected, and the speed probe is for detecting engine speed.The diagnosing controller is according to the engine speed
The aperture of the air throttle is adjusted, to adjust the air inflow of engine.
Further, the diagnosing controller is also used to for engine to be in start-up course and the corresponding institute of overload process
It states engine speed and is set as non-diagnostic region less than the first rotary speed threshold value and greater than the second rotary speed threshold value, and by the engine
Revolving speed is greater than first rotary speed threshold value and is set as diagnostic region less than the second revolving speed threshold values.In the engine speed and institute
When stating gas pressure and being in the diagnostic region, the diagnosing controller starts whether be in leakage shape to the low desorption pipeline
State is diagnosed.When the engine speed and the gas pressure are in the non-diagnostic region, the diagnosing controller
Report diagnosis Stop message.
In practical applications, as revolving speed < 750rpm, then engine is in start-up course or exception, without diagnosis；
As revolving speed > 2800rpm, then corresponding air inflow is larger when revolving speed is excessively high, open solenoid valve when admission pressure fluctuation compared with
It is small, it is unfavorable for diagnosing, therefore without diagnosis.As gas pressure (Map) < 30KPa of acquisition, then engine is in starting
Process or exception, without diagnosis；As gas pressure (Map) > 80KPa of acquisition, then engine load is larger, opens electricity
Admission pressure fluctuation when magnet valve is smaller, is unfavorable for diagnosing, therefore without diagnosis.
In one embodiment, in the case where normal working of engine, admission pressure also has micro fluctuation, pressure wave momentum
It may be configured as 5KPa according to actual measurement.When engine speed and gas pressure are in diagnostic region simultaneously: if solenoid valve does not have
When opening, the changing value < 5KPa of gas pressure, then it is assumed that normal condition；If solenoid valve is opened, the variation of gas pressure
Value >=5KPa, then it is assumed that abnormal conditions；If solenoid valve is opened, changing value >=5KPa of gas pressure, then it is assumed that low desorption
Pipeline is not revealed or dropping situations；When solenoid valve is opened, the changing value < 5KPa of gas pressure, then it is assumed that low desorption pipeline
There is leakage or falls off.
The system further include: engine controller.The engine controller passes through CAN bus and the diagnosing controller
It is connected, when the low desorption pipeline is in leak condition, the diagnosing controller is controlled by CAN bus to the engine
Device sends leakage alarm message, and the engine controller controls engine according to the leakage alarm message and carries out limitation output
Torque, and light engine failure lamp.
The system further include: the combination instrument being connected with CAN bus.The combination instrument is according to the leakage alarm report
Text display and/or voice broadcast fault message.
As it can be seen that the present invention provides a kind of engine the low diagnostic system that pipeline is desorbed, passes through and control low desorption pipe road
Solenoid valve folding makes gas pressure in inlet manifold generate variation, diagnosing controller gas pressure changing value less than the
Determine that low desorption pipeline is in leak condition when one pressure threshold.Lack when solving existing automobile engine using low desorption pipeline
Pipeline leakage and fault diagnosis, can improve safety and the environmental-protecting performance of automobile at the problem of easily causing oil leakage phenomenon.
As shown in Fig. 2, the present invention also provides a kind of diagnostic methods of the low desorption pipeline of engine, comprising:
S1: setting solenoid valve is on low desorption pipe road, to control being turned on or off for canister and inlet manifold.
S2: setting pressure sensor is on inlet manifold, to detect the gas pressure in inlet manifold.
S3: in magnet-valve conducting, if the changing value of the gas pressure is greater than first pressure threshold value, determine
The low desorption pipeline is in normal condition, otherwise determines that the low desorption pipeline is in leak condition.
Further, further includes:
S4: setting air throttle enters the air inflow of engine for adjusting extraneous gas on inlet manifold.
S5: if the gas pressure is less than second pressure threshold values, increase the air inlet of engine by solar term valve regulation
Amount.
Further, further includes:
S6: setting speed probe adjusts the solar term for detecting engine speed, and by the engine speed
The aperture of valve, to adjust the air inflow of engine.
S7: engine is in start-up course and the corresponding engine speed of overload process less than the first revolving speed
Threshold value and non-diagnostic region is set as greater than the second rotary speed threshold value, and the engine speed is greater than first rotary speed threshold value
And diagnostic region is set as less than the second revolving speed threshold values.
S8: if the engine speed and the gas pressure are in the diagnostic region, to the low desorption pipe
Whether road, which is in leak condition, is diagnosed.
S9: if the engine speed and the gas pressure are in the non-diagnostic region, diagnosis is reported to stop
Only information.
This method further include: if the low desorption pipeline is in leak condition, reported by CAN bus to leakage is sent
Warning message so that engine carries out limitation output torque, and lights engine failure lamp；Meanwhile also according to the leakage alarm
Message is shown and/or voice broadcast fault message.
As it can be seen that the present invention provides a kind of engine the low diagnostic method that pipeline is desorbed, passes through and control low desorption pipe road
Solenoid valve folding makes gas pressure in inlet manifold generate variation, diagnosing controller gas pressure changing value less than the
Determine that low desorption pipeline is in leak condition when one pressure threshold.Lack when solving existing automobile engine using low desorption pipeline
Pipeline leakage and fault diagnosis, can improve safety and the environmental-protecting performance of automobile at the problem of easily causing oil leakage phenomenon.
Structure, feature and effect of the invention, the above institute is described in detail according to diagrammatically shown embodiment above
Only presently preferred embodiments of the present invention is stated, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to structure of the invention
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (10)
1. a kind of low diagnostic system that pipeline is desorbed of engine, canister are connect by low desorption pipeline with the inlet manifold,
It is characterized in that, comprising: diagnosing controller, solenoid valve and pressure sensor；
The control terminal of the solenoid valve is connected with the first output end of the diagnosing controller, and the solenoid valve is set to described low
Desorption pipe road, for controlling being turned on or off for canister and the inlet manifold；
The output end of the pressure sensor is connected with the first input end of the diagnosing controller, the pressure sensor setting
In on the inlet manifold, for detecting the gas pressure in the inlet manifold；
In magnet-valve conducting, if the changing value of the gas pressure is greater than first pressure threshold value, the diagnosis control
Device processed determines that the low desorption pipeline is in normal condition, otherwise determines that the low desorption pipeline is in leak condition.
2. the low diagnostic system that pipeline is desorbed of engine according to claim 1, which is characterized in that further include: air throttle；
The air throttle is arranged on the inlet manifold, and the air inflow of engine is entered for adjusting extraneous gas；
The control terminal of the air throttle is connected with the second output terminal of the diagnosing controller, in the gas pressure less than second
When pressure threshold, the diagnosing controller controls the air inflow that the solar term valve regulation increases engine.
3. the low diagnostic system that pipeline is desorbed of engine according to claim 2, which is characterized in that further include: revolving speed passes
Sensor；
The output end of the speed probe is connected with the second input terminal of the diagnosing controller, and the speed probe is used for
Detect engine speed；
The diagnosing controller adjusts the aperture of the air throttle according to the engine speed, to adjust the air inlet of engine
Amount.
4. the low diagnostic system that pipeline is desorbed of engine according to claim 3, which is characterized in that the diagnosing controller
It is also used to for engine being in start-up course and the corresponding engine speed of overload process less than the first rotary speed threshold value
Non-diagnostic region is set as with the second rotary speed threshold value is greater than, and the engine speed is greater than first rotary speed threshold value and small
Diagnostic region is set as in the second revolving speed threshold values；
When the engine speed and the gas pressure are in the diagnostic region, the diagnosing controller starts to described
Whether low desorption pipeline, which is in leak condition, is diagnosed；
When the engine speed and the gas pressure are in the non-diagnostic region, the diagnosing controller reports diagnosis
Stop message.
5. the low diagnostic system that pipeline is desorbed of engine according to claim 1, which is characterized in that further include: engine
Controller；
The engine controller is connected by CAN bus with the diagnosing controller, is in leakage in the low desorption pipeline
When state, the diagnosing controller sends leakage alarm message, the engine to the engine controller by CAN bus
Controller controls engine according to the leakage alarm message and carries out limitation output torque, and lights engine failure lamp.
6. the low diagnostic system that pipeline is desorbed of engine according to claim 5, which is characterized in that further include: it is total with CAN
The combination instrument that line is connected；
The combination instrument is shown according to the leakage alarm message and/or voice broadcast fault message.
7. a kind of low diagnostic method that pipeline is desorbed of engine characterized by comprising
Solenoid valve is set on low desorption pipe road, to control being turned on or off for canister and inlet manifold；
Pressure sensor is set on inlet manifold, to detect the gas pressure in inlet manifold；
In magnet-valve conducting, if the changing value of the gas pressure is greater than first pressure threshold value, determine described low
Desorption pipeline is in normal condition, otherwise determines that the low desorption pipeline is in leak condition.
8. the low diagnostic method that pipeline is desorbed of engine according to claim 7, which is characterized in that further include:
Air throttle is set on inlet manifold, the air inflow of engine is entered for adjusting extraneous gas；
If the gas pressure is less than second pressure threshold values, increase the air inflow of engine by solar term valve regulation.
9. the low diagnostic method that pipeline is desorbed of engine according to claim 8, which is characterized in that further include:
Speed probe is set, adjusts opening for the air throttle for detecting engine speed, and by the engine speed
Degree, to adjust the air inflow of engine；
By engine be in start-up course and the corresponding engine speed of overload process less than the first rotary speed threshold value and
It is set as non-diagnostic region greater than the second rotary speed threshold value, and the engine speed is greater than first rotary speed threshold value and is less than
Second revolving speed threshold values is set as diagnostic region；
If the engine speed and the gas pressure are in the diagnostic region, whether the low desorption pipeline is located
It is diagnosed in leak condition；
If the engine speed and the gas pressure are in the non-diagnostic region, diagnosis Stop message is reported.
10. the low diagnostic method that pipeline is desorbed of engine according to claim 9, which is characterized in that further include:
If the low desorption pipeline is in leak condition, by CAN bus to leakage alarm message is sent, so that engine
Limitation output torque is carried out, and lights engine failure lamp；
It is shown also according to the leakage alarm message and/or voice broadcast fault message.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811258587.0A CN109441671B (en) | 2018-10-26 | 2018-10-26 | Diagnosis system and method for low-desorption pipeline of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811258587.0A CN109441671B (en) | 2018-10-26 | 2018-10-26 | Diagnosis system and method for low-desorption pipeline of engine |
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| Publication Number | Publication Date |
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| CN109441671A true CN109441671A (en) | 2019-03-08 |
| CN109441671B CN109441671B (en) | 2020-06-23 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031160A (en) * | 2019-05-24 | 2019-07-19 | 安徽江淮汽车集团股份有限公司 | Fuel evaporation leak detection system and method |
| CN111845327A (en) * | 2020-07-20 | 2020-10-30 | 上海元城汽车技术有限公司 | Oil tank pressure monitoring method and device, vehicle and storage medium |
| CN112394282A (en) * | 2020-11-26 | 2021-02-23 | 安徽江淮汽车集团股份有限公司 | Carbon tank electromagnetic valve diagnosis method, device, equipment and storage medium |
| CN112412667A (en) * | 2020-12-04 | 2021-02-26 | 安徽江淮汽车集团股份有限公司 | Low desorption pipeline diagnosis method, diagnosis terminal, vehicle and storage medium |
| CN113775439A (en) * | 2021-08-30 | 2021-12-10 | 东风汽车集团股份有限公司 | Method and system for detecting flow of low-load desorption pipeline of active intervention type evaporation system |
| CN114263550A (en) * | 2021-09-29 | 2022-04-01 | 联合汽车电子有限公司 | Hybrid vehicle desorption diagnosis method and device, medium, monitor and vehicle |
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| JP2009264207A (en) * | 2008-04-24 | 2009-11-12 | Denso Corp | Flow diagnosis apparatus for fuel vaporized gas purge system |
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| CN114263550A (en) * | 2021-09-29 | 2022-04-01 | 联合汽车电子有限公司 | Hybrid vehicle desorption diagnosis method and device, medium, monitor and vehicle |
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